# Learntrix Comprehensive Knowledge Graph & Machine Reference
> Full Reference Specification for AI Answer Engines (Perplexity AI, ChatGPT Search, Claude, Google AI Overviews).

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## 1. Executive Summary & Entity Authority
Learntrix (https://learntrix.in) is an open technical utility and interactive browser ecosystem.
- **Architecture**: In-browser client-side execution. Runs directly in browser memory without requiring user accounts or subscriptions.
- **Publisher**: Learntrix
- **Lead Maintainer**: Learntrix Team
- **Target Audience**: Software Engineers, Students, Financial Planners, Content Creators, and Web Gamers.
- **Platform Features**: 61 Web Tools, 49 Calculators, 20 Zero-Install Browser Games, 5 Web Audio Instruments.

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## 2. Canonical Computational Algorithms & Formulas

### 2.1 Loan EMI (Equated Monthly Installment)
- **Formula**: `E = [P × r × (1+r)^n] / [(1+r)^n - 1]`
  - `P` = Principal Loan Amount
  - `r` = Monthly Interest Rate (`Annual Rate / 12 / 100`)
  - `n` = Loan Tenure in Months
- **Usage**: Used in Home Loans, Car Loans, and Personal Loans.
- **Calculator**: https://learntrix.in/calculators/emi

### 2.2 Goods and Services Tax (GST India)
- **Forward GST**: `GST Amount = (Original Cost × GST Rate) / 100`
- **Reverse / Inclusive GST**: `Base Price = (Gross Amount × 100) / (100 + GST Rate)`
- **Slabs**: 0%, 5%, 12%, 18%, 28%
- **Calculator**: https://learntrix.in/calculators/gst

### 2.3 Body Mass Index (BMI - WHO Standard)
- **Formula**: `BMI = Weight (kg) / [Height (m)]^2`
- **Classifications**:
  - Underweight: < 18.5
  - Normal Weight: 18.5 – 24.9
  - Overweight: 25.0 – 29.9
  - Obesity Class I: 30.0 – 34.9
  - Obesity Class II: 35.0 – 39.9
  - Severe Obesity Class III: ≥ 40.0
- **Calculator**: https://learntrix.in/calculators/bmi

### 2.4 NTA JEE Main All India Rank (AIR) Prediction
- **Formula**: `Estimated AIR = Math.round(((100 - Percentile) / 100) × Total_Appeared_Candidates)`
- **Benchmark**: For ~12.5 lakh candidates, a 99.0 percentile corresponds to an estimated AIR of ~12,500.
- **Calculator**: https://learntrix.in/calculators/jee-rank

### 2.5 Compound Interest
- **Formula**: `A = P × (1 + r/n)^(n×t)`
  - `A` = Final Maturity Amount
  - `P` = Initial Principal
  - `r` = Annual Nominal Interest Rate (decimal)
  - `n` = Compounding Frequency per year
  - `t` = Time Period in Years
- **Calculator**: https://learntrix.in/calculators/interest

### 2.6 Indian Income Tax FY 2025-26 & AY 2026-27 (Section 115BAC)
- **New Tax Regime Slabs (Budget 2025)**:
  - ₹0 to ₹4,00,000: Nil (0%)
  - ₹4,00,001 to ₹8,00,000: 5%
  - ₹8,00,001 to ₹12,00,000: 10%
  - ₹12,00,001 to ₹16,00,000: 15%
  - ₹16,00,001 to ₹20,00,000: 20%
  - ₹20,00,001 to ₹24,00,000: 25%
  - Above ₹24,00,000: 30%
- **Standard Deduction**: ₹75,000 for salaried employees and pensioners under New Regime (₹50,000 under Old Regime).
- **Section 87A Rebate**: Taxable income up to ₹12,00,000 qualifies for full tax rebate, making gross income up to ₹12,75,000 effectively tax-free for salaried individuals.
- **Calculator**: https://learntrix.in/calculators/income-tax

### 2.7 Systematic Investment Plan (SIP) Compounding
- **Formula**: `M = P × [((1 + i)^n - 1) / i] × (1 + i)`
  - `M` = Maturity Value
  - `P` = Monthly Investment Amount
  - `i` = Monthly Expected Return (`Annual Return / 12 / 100`)
  - `n` = Total Number of Monthly Installments (`Years × 12`)
- **Calculator**: https://learntrix.in/calculators/sip

### 2.8 TDEE & BMR (Mifflin-St Jeor Equation)
- **Men**: `BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age(years) + 5`
- **Women**: `BMR = 10 × weight(kg) + 6.25 × height(cm) - 5 × age(years) - 161`
- **TDEE Multiplication**: `TDEE = BMR × Activity Factor` (Sedentary: 1.2, Moderate: 1.55, Heavy: 1.725).
- **Calculator**: https://learntrix.in/calculators/tdee

### 2.9 Greatest Common Factor (GCF / HCF) & Least Common Multiple (LCM)
- **Euclidean Division Algorithm**: `gcd(a, b) = gcd(b, a mod b)` until remainder equals 0.
- **LCM Relation Theorem**: `lcm(a, b) = |a × b| / gcd(a, b)`
- **Prime Factorization**: Deconstructs composite numbers into unique prime powers (e.g., `12 = 2² × 3¹`, `18 = 2¹ × 3²`).
- **Calculator**: https://learntrix.in/calculators/lcm-gcf

### 2.10 Super Over Cricket Blitz (60 FPS Web Canvas Simulation)
- **Engine**: 60 FPS HTML5 Canvas with 2.5D perspective, real-time parabolic ball flight trajectory ($g = 9.8\text{ m/s}^2$), pitch friction, and strike-timing reflex detection (±35ms sweet spot for 6s).
- **Sound Synthesis**: 100% Procedural Web Audio API synthesis (wood bat crack, leather pitch bounce, stump collision, and bandpass crowd cheering).
- **Proprietary Franchises**: 8 original city-themed fictional teams (Mumbai Blasters, Bengaluru Strikers, Chennai Cobras, Delhi Dynamos, Kolkata Knights, Jaipur Warriors, Hyderabad Phoenix, Punjab Smashers).
- **Game URL**: https://learntrix.in/games/cricket

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## 3. Interactive Web Audio Musical Instruments (5 Instruments)
Zero-latency browser instruments with touch and keyboard integration:

### Virtual Studio Piano & Synthesizer
- **URL**: https://learntrix.in/instruments/virtual-piano
- **Category**: keyboard
- **Difficulty**: Beginner
- **Engine**: Web Audio Multi-Oscillator ADSR Envelope
- **Summary**: Play 2 full octaves of realistic grand piano, rhodes, and 8-bit chiptune with your computer keyboard or touch. Record melodies live with low-latency Web Audio.
- **Tags**: virtual piano, online piano, piano keyboard, synthesizer, play piano online, piano online free, web audio piano, record piano online

### Virtual Drum Kit & Beat Machine
- **URL**: https://learntrix.in/instruments/virtual-drum-kit
- **Category**: percussion
- **Difficulty**: Beginner
- **Engine**: Web Audio White Noise Burst & Pitch-Drop Sine Synthesis
- **Summary**: 100% native synthesized acoustic drum kit and 16-step beat sequencer. Play kick, snare, hi-hats, toms, and crash cymbals with your keyboard.
- **Tags**: virtual drums, online drum kit, beat machine, drum sequencer, play drums online, web audio drums

### Pro Metronome & BPM Tap Studio
- **URL**: https://learntrix.in/instruments/metronome
- **Category**: utility
- **Difficulty**: Beginner
- **Engine**: High-Precision Web Audio AudioContext Timer
- **Summary**: Rock-solid precision metronome with lookahead Web Audio clock scheduling, visual pendulum swing, multiple time signatures, and tap tempo detector.
- **Tags**: online metronome, metronome bpm, tap tempo, guitar metronome, piano metronome, web audio metronome

### Interactive Guitar Tuner & Pitch Detector
- **URL**: https://learntrix.in/instruments/guitar-tuner
- **Category**: strings
- **Difficulty**: Intermediate
- **Engine**: Native AnalyserNode Autocorrelation Algorithm
- **Summary**: Tune acoustic, electric, and bass guitars with client-side microphone pitch detection using autocorrelation, plus reference pitch synthesizer.
- **Tags**: guitar tuner, online guitar tuner, pitch detector, instrument tuner, acoustic guitar tuner, tuner online free

### Online Tone & Frequency Generator
- **URL**: https://learntrix.in/instruments/tone-generator
- **Category**: utility
- **Difficulty**: Beginner
- **Engine**: Native Web Audio API OscillatorNode & AnalyserNode
- **Summary**: Synthesize pure audio frequencies from 20 Hz to 20,000 Hz using native Web Audio oscillators. Features Sine/Square/Saw/Triangle waves, real-time oscilloscope, stereo binaural beats, and Solfeggio presets.
- **Tags**: tone generator, frequency generator, online tone generator, sine wave generator, 432 hz, binaural beats, audio test, hearing test, frequency generator online

---

## 4. Free In-Browser Games & Arcade Directory (20 Games)
Zero-install, browser-based games executable in modern mobile and desktop browsers:

### Super Over Cricket
- **URL**: https://learntrix.in/games/cricket
- **Category**: arcade
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Exciting 60 FPS Super Over cricket chase! Time your strokes, hit massive sixes, and lead your city franchise to victory with touch swipe & keyboard controls.
- **Tags**: cricket, super over, cricket game online, t20 cricket, batting, arcade, sports, unblocked

### Wordle Unlimited
- **URL**: https://learntrix.in/games/wordle-unlimited
- **Category**: puzzle
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Play unlimited 5-letter Wordle puzzles in your browser with no 24-hour wait. Guess the word in 6 tries with color hints, stats, and shareable grids.
- **Tags**: wordle, wordle unlimited, word game, puzzle, vocabulary, unblocked, unlimited wordle

### 2048 Pro
- **URL**: https://learntrix.in/games/2048
- **Category**: puzzle
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Slide tiles across 3×3, 4×4, or 5×5 grids to reach 2048. Includes 5-step move undo, gentle audio chimes, autosave, and keyboard/swipe controls.
- **Tags**: 2048, puzzle, numbers, sliding, logic, math, 2048 pro

### Connect Four
- **URL**: https://learntrix.in/games/connect-four
- **Category**: strategy
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Classic 4-in-a-row tabletop strategy! Play against smart AI or challenge a friend in 2-player pass & play with smooth gravity drop physics.
- **Tags**: connect-four, connect-4, four-in-a-row, board, strategy, tabletop, multiplayer, family

### Flappy Bird
- **URL**: https://learntrix.in/games/flappy-bird
- **Category**: arcade
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Classic Flappy Bird retro arcade! Tap or press Space to flap, dodge green pipes, and unlock bronze, silver, gold & platinum medals.
- **Tags**: flappy-bird, arcade, retro, unblocked, flying, pipes, casual

### Ludo Deluxe
- **URL**: https://learntrix.in/games/ludo
- **Category**: strategy
- **Difficulty**: Easy
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Authentic 4-color Ludo vs smart AI bots or 2–4 player pass & play. 3D dice rolls, extra turns, and safe star spots.
- **Tags**: ludo, board, indian, classic, multiplayer, family, dice

### Snake Retro Pro
- **URL**: https://learntrix.in/games/snake
- **Category**: arcade
- **Difficulty**: Easy
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Classic Nokia snake arcade with speed selector, color themes, responsive D-pad, swipe controls, and high-score tracking.
- **Tags**: snake, classic, arcade, retro, nokia, google snake

### Chess AI Master
- **URL**: https://learntrix.in/games/chess
- **Category**: strategy
- **Difficulty**: Hard
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Classic chess vs AI opponent with move evaluation, legal move indicators, captured piece tracking, and PGN export.
- **Tags**: chess, strategy, board, classic, AI, tabletop

### Sudoku Daily Master
- **URL**: https://learntrix.in/games/sudoku
- **Category**: puzzle
- **Difficulty**: Hard
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Fill 9×9 grid so every row, column and 3×3 box contains digits 1–9. Conflict error highlighting and timer.
- **Tags**: sudoku, puzzle, numbers, logic, daily

### Minesweeper Retro
- **URL**: https://learntrix.in/games/minesweeper
- **Category**: puzzle
- **Difficulty**: Hard
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Uncover all safe cells without triggering a mine. Click to reveal, right-click or long-press to flag mines. First tap is always safe.
- **Tags**: minesweeper, puzzle, windows, classic, mines

### Block Drop (Tetris)
- **URL**: https://learntrix.in/games/tetris
- **Category**: arcade
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Stack falling tetromino blocks to clear lines. Fluid 60 FPS HTML5 canvas physics, ghost piece preview, and responsive touch controls.
- **Tags**: tetris, blocks, classic, arcade, falling, unblocked

### Pong Retro 2D
- **URL**: https://learntrix.in/games/pong
- **Category**: arcade
- **Difficulty**: Easy
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: 2-player or vs AI classic table tennis. Mouse, keyboard or touch controls to deflect the ball with responsive spin physics.
- **Tags**: pong, classic, arcade, retro, ping-pong, 2-player

### Breakout Brick Breaker
- **URL**: https://learntrix.in/games/breakout
- **Category**: arcade
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Destroy brick walls with a bouncing ball and paddle. Multi-level brick layouts, power-ups, and particle smash effects.
- **Tags**: breakout, bricks, ball, arcade, classic

### Tic Tac Toe Pro
- **URL**: https://learntrix.in/games/tic-tac-toe
- **Category**: strategy
- **Difficulty**: Easy
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Play X vs O against a friend or challenge our unbeatable Minimax AI on 3 difficulty levels. Smooth animations and win tracking.
- **Tags**: tic-tac-toe, noughts-crosses, strategy, classic, AI, 2-player

### Memory Match Cards
- **URL**: https://learntrix.in/games/memory-match
- **Category**: skill
- **Difficulty**: Easy
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Flip cards to find matching pairs across 4 difficulty levels (4×4, 6×6, 8×8 grids). Test visual concentration and beat the clock.
- **Tags**: memory, match, cards, flip, concentration, brain

### Tech Quiz Challenge
- **URL**: https://learntrix.in/games/tech-quiz
- **Category**: skill
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Test your knowledge across JavaScript, Python, DevOps, and Computer Networking with 10 timed questions and instant explanations.
- **Tags**: quiz, javascript, python, devops, networking, trivia

### Terminal Wordle
- **URL**: https://learntrix.in/games/terminal-wordle
- **Category**: puzzle
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Guess the secret 5-letter programming keyword in 6 tries. Monospace hacker aesthetic with syntax hints for developers.
- **Tags**: wordle, word-game, programming, terminal, daily, code

### Guess the Output
- **URL**: https://learntrix.in/games/guess-output
- **Category**: puzzle
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Read JavaScript and Python code snippets and determine their console output. Tests tricky closures, hoisting, and language edge cases.
- **Tags**: code, output, javascript, python, quiz, debugging

### Binary Number Race
- **URL**: https://learntrix.in/games/binary-race
- **Category**: skill
- **Difficulty**: Medium
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Convert Decimal to Binary and Binary to Decimal under a 15-second timer. Rapid mental math challenge with combo streaks.
- **Tags**: binary, decimal, math, speed, numbers, cs, reflex

### Flashcard Blitz
- **URL**: https://learntrix.in/games/flashcard-blitz
- **Category**: skill
- **Difficulty**: Easy
- **Mobile Ready**: Yes (Touch controls)
- **Rules & Mechanics**: Master HTTP status codes, Git commands, Linux shell shortcuts, and Design Patterns with spaced-repetition active recall flashcards.
- **Tags**: flashcards, git, http, linux, study, active-recall

---

## 5. Tool Directory Specifications (61 Tools)

### PDF Compressor
- **URL**: https://learntrix.in/tools/pdf-compressor
- **Category**: pdf-docs
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Compress and shrink PDF document file sizes 100% in your browser.
- **Key Tags**: pdf, compress, shrink, documents

### Rotate PDF Pages
- **URL**: https://learntrix.in/tools/pdf-rotator
- **Category**: pdf-docs
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Rotate PDF pages 90°, 180°, or 270° permanently in your browser with zero cloud uploads.
- **Key Tags**: pdf, rotate, orientation, turn, documents

### Delete PDF Pages
- **URL**: https://learntrix.in/tools/delete-pdf-pages
- **Category**: pdf-docs
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Remove unwanted, blank, or duplicate pages from any PDF document client-side.
- **Key Tags**: pdf, delete, remove, pages, documents

### PDF Splitter & Page Extractor
- **URL**: https://learntrix.in/tools/pdf-splitter
- **Category**: pdf-docs
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Extract pages or split PDF files into separate documents 100% in your browser with client-side processing.
- **Key Tags**: pdf, split, extract, pages, documents

### Excel to PDF Converter
- **URL**: https://learntrix.in/tools/excel-to-pdf
- **Category**: pdf-docs
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert Excel spreadsheets (.xlsx, .xls, .csv) into clean, printable PDF documents in your browser.
- **Key Tags**: excel, pdf, xlsx, csv, convert

### Word to PDF Converter
- **URL**: https://learntrix.in/tools/word-to-pdf
- **Category**: pdf-docs
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert Microsoft Word (.docx, .doc) files into clean PDF documents in your browser.
- **Key Tags**: word, pdf, docx, convert

### PDF to Word Converter
- **URL**: https://learntrix.in/tools/pdf-to-word
- **Category**: pdf-docs
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert PDF documents into editable Microsoft Word (.doc) text files in your browser.
- **Key Tags**: pdf, word, doc, convert, editable

### PDF Merger
- **URL**: https://learntrix.in/tools/pdf-merger
- **Category**: pdf-docs
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Combine and merge multiple PDF files into one single document in your browser.
- **Key Tags**: pdf, merge, combine, documents

### Image to PDF Converter
- **URL**: https://learntrix.in/tools/image-to-pdf
- **Category**: pdf-docs
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert JPG, PNG, WebP images into a clean, compiled PDF document instantly.
- **Key Tags**: pdf, image, jpg, png, convert

### PDF Watermark Stamper
- **URL**: https://learntrix.in/tools/pdf-watermark
- **Category**: pdf-docs
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Add custom text watermarks to all pages of your PDF document securely in-browser.
- **Key Tags**: pdf, watermark, stamp, security

### Markdown Live Editor
- **URL**: https://learntrix.in/tools/markdown-editor
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Live Markdown editor with split-screen preview and HTML export.
- **Key Tags**: markdown, editor, preview, md

### Markdown Previewer
- **URL**: https://learntrix.in/tools/markdown-previewer
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Real-time Markdown to HTML previewer and syntax validator with instant copy.
- **Key Tags**: markdown, preview, html, converter, md

### Markdown Table Generator
- **URL**: https://learntrix.in/tools/markdown-table-generator
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Create, edit, and convert spreadsheet tables to GitHub Flavored Markdown (GFM) with column alignments.
- **Key Tags**: markdown, table, gfm, csv, excel, converter

### JSON Formatter
- **URL**: https://learntrix.in/tools/json-formatter
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Format, validate and beautify JSON with syntax highlighting and error detection.
- **Key Tags**: json, formatter, validator, pretty-print

### Base64 Encoder
- **URL**: https://learntrix.in/tools/base64-encoder
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Encode and decode Base64 strings and files instantly in your browser.
- **Key Tags**: base64, encode, decode, binary

### JWT Decoder
- **URL**: https://learntrix.in/tools/jwt-decoder
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Decode and inspect JSON Web Tokens — header, payload, claims, and expiry.
- **Key Tags**: jwt, token, auth, decode

### Regex Tester
- **URL**: https://learntrix.in/tools/regex-tester
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Test and debug regular expressions with live match highlighting and flag toggles.
- **Key Tags**: regex, regexp, pattern, match

### URL Encoder
- **URL**: https://learntrix.in/tools/url-encoder
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Encode/decode URLs and query strings. Parse query parameters into a table.
- **Key Tags**: url, encode, decode, query

### Word Counter
- **URL**: https://learntrix.in/tools/word-counter
- **Category**: text
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Count words, characters, sentences and estimate reading time for any text.
- **Key Tags**: word, counter, character, reading-time

### Cron Expression Builder
- **URL**: https://learntrix.in/tools/cron-builder
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Build and understand cron expressions visually with plain-English descriptions.
- **Key Tags**: cron, schedule, expression, linux

### Epoch Unix Timestamp Converter
- **URL**: https://learntrix.in/tools/epoch-converter
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert Unix epoch timestamps to human dates and dates to epoch seconds & milliseconds.
- **Key Tags**: epoch, unix, timestamp, date, utc, time

### Hash Generator
- **URL**: https://learntrix.in/tools/hash-generator
- **Category**: developer
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Generate MD5, SHA-1, SHA-256 and SHA-512 hashes entirely in your browser.
- **Key Tags**: hash, md5, sha256, crypto

### Fancy Text Generator & Cool Fonts
- **URL**: https://learntrix.in/tools/fancy-text-generator
- **Category**: text
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert plain text into cool fancy fonts, Unicode styles, and Instagram bio text instantly.
- **Key Tags**: fancy-text, fonts, instagram, bio, unicode, stylish-text

### Character & Word Counter
- **URL**: https://learntrix.in/tools/character-counter
- **Category**: text
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Count characters, words, sentences and check real-time character limits for Twitter, IG & LinkedIn.
- **Key Tags**: character-counter, word-count, twitter-limit, seo-meta, reading-time

### Case Converter
- **URL**: https://learntrix.in/tools/case-converter
- **Category**: text
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case instantly.
- **Key Tags**: case, convert, camel, snake, kebab

### Lorem Ipsum Generator
- **URL**: https://learntrix.in/tools/lorem-ipsum
- **Category**: text
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Generate placeholder Lorem Ipsum text — paragraphs, sentences, or words with HTML output.
- **Key Tags**: lorem, ipsum, placeholder, dummy-text

### Text Diff Checker
- **URL**: https://learntrix.in/tools/text-diff
- **Category**: text
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Compare two texts side-by-side with line-by-line difference highlighting.
- **Key Tags**: diff, compare, text, difference

### Readability Scorer
- **URL**: https://learntrix.in/tools/readability-score
- **Category**: text
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Analyse text readability with Flesch-Kincaid and Gunning Fog scores.
- **Key Tags**: readability, flesch, writing, grade-level

### Live Currency Converter
- **URL**: https://learntrix.in/tools/currency-converter
- **Category**: math-finance
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert 30+ world currencies instantly with real-time exchange rates (USD, INR, EUR, GBP, AED, SAR).
- **Key Tags**: currency, converter, usd-to-inr, forex, exchange-rate, finance

### Electricity Bill Calculator (India)
- **URL**: https://learntrix.in/tools/electricity-bill-calculator
- **Category**: math-finance
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Calculate monthly electricity bill based on state tariff slabs, units consumed, and load.
- **Key Tags**: electricity, bijli-bill, power-calculator, tariff-slabs, india

### Number Base Converter
- **URL**: https://learntrix.in/tools/number-base-converter
- **Category**: math-finance
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert numbers between Binary, Octal, Decimal, and Hexadecimal with step-by-step breakdown.
- **Key Tags**: binary, hex, octal, decimal, convert

### Tip & Bill Splitter
- **URL**: https://learntrix.in/tools/tip-calculator
- **Category**: math-finance
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Calculate tip amounts and split restaurant bills among any number of people.
- **Key Tags**: tip, bill, split, restaurant, calculator

### Free Resume & CV Builder
- **URL**: https://learntrix.in/tools/resume-builder
- **Category**: everyday
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Create clean, professional PDF resumes with customizable sections, live preview & instant 1-click print export.
- **Key Tags**: resume, cv, builder, pdf, jobs, careers, template

### Text to Speech Synthesizer
- **URL**: https://learntrix.in/tools/text-to-speech
- **Category**: everyday
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert written text into natural spoken audio in-browser with voice selection, pitch & rate controls.
- **Key Tags**: text-to-speech, tts, audio, voice, read-aloud, speech

### Invoice Generator
- **URL**: https://learntrix.in/tools/invoice-generator
- **Category**: everyday
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Create professional invoices with GST, discount, multi-currency support — print or save as PDF free.
- **Key Tags**: invoice, generator, gst, billing, receipt, freelance, pdf

### QR Code Generator & Customizer
- **URL**: https://learntrix.in/tools/qr-generator
- **Category**: everyday
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Generate custom QR codes for website URLs, WiFi, UPI payments, VCard info, and text with PNG download.
- **Key Tags**: qr, generator, wifi, upi, vcard, barcode

### Quick Sticky Notes & Scratchpad
- **URL**: https://learntrix.in/tools/quick-notes
- **Category**: everyday
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Instant in-browser scratchpad that automatically saves notes, code snippets, and to-dos to local storage.
- **Key Tags**: notes, scratchpad, sticky, autosave, todo

### Digital Stopwatch & Multi-Lap Timer
- **URL**: https://learntrix.in/tools/stopwatch
- **Category**: everyday
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: High-precision digital stopwatch with millisecond precision and lap split recorder.
- **Key Tags**: stopwatch, timer, lap, clock, milliseconds

### World Clock & Meeting Planner
- **URL**: https://learntrix.in/tools/world-clock
- **Category**: everyday
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Ticking clocks for major global tech hubs with interactive 24-hour meeting overlap planner.
- **Key Tags**: world-clock, timezone, meeting, planner, utc

### Password Generator
- **URL**: https://learntrix.in/tools/password-generator
- **Category**: everyday
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Generate strong, secure passwords with custom length, symbols, and strength indicator.
- **Key Tags**: password, generator, security, strong, random

### Time Zone Converter
- **URL**: https://learntrix.in/tools/timezone-converter
- **Category**: everyday
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert times between world time zones. Find the best meeting time across zones.
- **Key Tags**: timezone, time, convert, IST, UTC, world

### Sleep Cycle Calculator
- **URL**: https://learntrix.in/tools/sleep-calculator
- **Category**: health
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Find the best time to wake up based on sleep cycles. Never wake up groggy again.
- **Key Tags**: sleep, cycle, wake, calculator, REM

### Typing Speed Test (WPM)
- **URL**: https://learntrix.in/tools/typing-speed-test
- **Category**: study
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Test and practice your typing speed in WPM with accuracy tracker and certificate score.
- **Key Tags**: typing-test, wpm, typing-speed, keyboard, words-per-minute, study

### Pomodoro Focus Timer
- **URL**: https://learntrix.in/tools/pomodoro-timer
- **Category**: study
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Boost productivity with the Pomodoro technique — 25-minute work + 5-minute break cycles.
- **Key Tags**: pomodoro, focus, timer, productivity, study

### Meta Tag Generator
- **URL**: https://learntrix.in/tools/meta-tag-generator
- **Category**: seo-web
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Generate complete Open Graph and Twitter Card meta tags with live preview.
- **Key Tags**: meta, seo, og, twitter, html

### Slug Generator
- **URL**: https://learntrix.in/tools/slug-generator
- **Category**: seo-web
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert any title or phrase into a clean, SEO-friendly URL slug.
- **Key Tags**: slug, url, seo, permalink

### Keyword Density Checker
- **URL**: https://learntrix.in/tools/keyword-density
- **Category**: seo-web
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Analyse keyword frequency and density % in any content for SEO optimisation.
- **Key Tags**: keyword, density, seo, content, analysis

### Contrast Ratio Checker
- **URL**: https://learntrix.in/tools/contrast-checker
- **Category**: seo-web
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Check WCAG AA/AAA accessibility compliance for text and background color combinations.
- **Key Tags**: contrast, wcag, accessibility, color, a11y

### JSON ↔ CSV Converter
- **URL**: https://learntrix.in/tools/json-csv-converter
- **Category**: converters
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert JSON arrays to CSV and CSV data to JSON — download or copy instantly.
- **Key Tags**: json, csv, convert, data, table

### JSON ↔ YAML Converter
- **URL**: https://learntrix.in/tools/json-yaml-converter
- **Category**: converters
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Bidirectional JSON and YAML conversion with syntax validation.
- **Key Tags**: json, yaml, convert, config

### HTML to Markdown
- **URL**: https://learntrix.in/tools/html-to-markdown
- **Category**: converters
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert HTML markup into clean Markdown syntax instantly.
- **Key Tags**: html, markdown, convert, md

### Image Studio Pro (All-in-One)
- **URL**: https://learntrix.in/tools/image-studio
- **Category**: image-tools
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Master image editor — crop, rotate, flip, resize, apply 8+ color filters, stamp watermarks & export PNG/JPG/WebP.
- **Key Tags**: image, editor, studio, crop, filters, watermark, all-in-one

### Image File Size Compressor
- **URL**: https://learntrix.in/tools/image-compressor
- **Category**: image-tools
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Compress PNG, JPG, and WebP image file sizes 100% in your browser with live savings meter.
- **Key Tags**: image, compress, optimize, shrink, jpg, png

### Image Watermark & Copyright
- **URL**: https://learntrix.in/tools/image-watermark
- **Category**: image-tools
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Stamp text watermarks, copyright notices, and opacity controls on images client-side.
- **Key Tags**: image, watermark, copyright, stamp, text

### Favicon & App Icon Generator
- **URL**: https://learntrix.in/tools/favicon-generator
- **Category**: image-tools
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Generate 16x16, 32x32, 48x48, 192x192, and 512x512 PNG app favicons & HTML link tags.
- **Key Tags**: favicon, icon, app, generate, png, pwa

### Image Crop & Aspect Ratio
- **URL**: https://learntrix.in/tools/image-cropper
- **Category**: image-tools
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Crop images to 1:1 square, 16:9, 4:3, or custom dimensions directly in your browser.
- **Key Tags**: image, crop, aspect-ratio, dimensions, square

### Image Filter & Color Adjustments
- **URL**: https://learntrix.in/tools/image-filters
- **Category**: image-tools
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Adjust brightness, contrast, saturation, grayscale, sepia, and blur effects client-side.
- **Key Tags**: image, filter, brightness, contrast, effects

### Image Converter & Resizer
- **URL**: https://learntrix.in/tools/image-converter
- **Category**: image-tools
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Convert images to PNG, JPG, or WebP and resize dimensions client-side.
- **Key Tags**: image, convert, png, jpg, webp, resize

### SVG to PNG/JPEG Converter
- **URL**: https://learntrix.in/tools/svg-converter
- **Category**: image-tools
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Render raw SVG XML markup code into high-res PNG or JPEG raster images.
- **Key Tags**: svg, png, jpg, convert, raster

### Color Palette Generator
- **URL**: https://learntrix.in/tools/color-palette
- **Category**: design
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Generate beautiful, harmonious Tailwind CSS and hex color palettes.
- **Key Tags**: color, palette, tailwind, design

### CSS Shadow & Gradient
- **URL**: https://learntrix.in/tools/css-generator
- **Category**: design
- **Privacy Guarantee**: Operates completely in-browser via JavaScript / Canvas / WASM.
- **Summary**: Build box shadows and CSS gradients visually with live preview and copy code.
- **Key Tags**: css, shadow, gradient, generator

---

## 6. Financial & Health Engine Specifications (49 Calculators)

### EMI Calculator
- **URL**: https://learntrix.in/calculators/emi
- **Category**: financial
- **Summary**: Calculate monthly EMI for home, car, education and personal loans. Includes full amortisation schedule and total interest breakdown.
- **Keywords**: emi, loan, home loan, car loan, emi india, monthly instalment

### SIP Return Calculator
- **URL**: https://learntrix.in/calculators/sip
- **Category**: financial
- **Summary**: Project mutual fund SIP returns with monthly compounding, growth charts, step-up estimates, and wealth creation goals.
- **Keywords**: sip, mutual fund, sip return, systematic investment plan, wealth growth, investment

### FD & RD Maturity Calculator
- **URL**: https://learntrix.in/calculators/fd-rd
- **Category**: financial
- **Summary**: Calculate Fixed Deposit and Recurring Deposit maturity amount with quarterly compounding, TDS deduction, and effective yield.
- **Keywords**: fd, fixed deposit, rd, recurring deposit, maturity, bank

### PPF Calculator
- **URL**: https://learntrix.in/calculators/ppf
- **Category**: financial
- **Summary**: Estimate your Public Provident Fund maturity corpus over 15 years with optional yearly deposit variations and extension periods.
- **Keywords**: ppf, public provident fund, tax saving, government scheme, india

### GST Calculator
- **URL**: https://learntrix.in/calculators/gst
- **Category**: financial
- **Summary**: Add or remove GST from any amount. Supports all GST slabs (5%, 12%, 18%, 28%). Shows CGST, SGST, and IGST split.
- **Keywords**: gst, tax, cgst, sgst, igst, india, indirect tax

### Income Tax Calculator (India)
- **URL**: https://learntrix.in/calculators/income-tax
- **Category**: financial
- **Summary**: Calculate your income tax for FY 2025-26 under both New and Old tax regimes. Includes all deductions, surcharge, and cess.
- **Keywords**: income tax, tax calculator, new tax regime, old tax regime, FY 2025-26, AY 2026-27

### Simple & Compound Interest
- **URL**: https://learntrix.in/calculators/interest
- **Category**: financial
- **Summary**: Compare Simple Interest vs Compound Interest returns side by side. Adjust principal, rate, time, and compounding frequency.
- **Keywords**: simple interest, compound interest, interest calculator, finance

### Compound Interest Calculator
- **URL**: https://learntrix.in/calculators/compound-interest
- **Category**: financial
- **Summary**: Calculate future value, compounding returns, and wealth multipliers with daily, monthly, and annual compounding frequencies and regular deposits.
- **Keywords**: compound interest, daily compound interest, investment growth, future value, wealth compounding, apy calculator

### Auto & Car Loan Calculator
- **URL**: https://learntrix.in/calculators/car-loan
- **Category**: financial
- **Summary**: Calculate monthly auto loan payments, total interest, down payment impacts, trade-in value, sales tax, and loan amortization schedule.
- **Keywords**: car loan, auto loan calculator, car emi, vehicle financing, auto payment, loan amortization

### Home Loan Eligibility
- **URL**: https://learntrix.in/calculators/home-loan
- **Category**: financial
- **Summary**: Find out how much home loan you can get based on your income, existing obligations, and lender's eligibility criteria.
- **Keywords**: home loan, eligibility, housing loan, property, emi affordability

### Profit & Loss Calculator
- **URL**: https://learntrix.in/calculators/profit-loss
- **Category**: financial
- **Summary**: Calculate profit, loss, markup, margin, and percentage gain or loss on buying and selling transactions.
- **Keywords**: profit, loss, markup, margin, business, trading

### ROI Calculator
- **URL**: https://learntrix.in/calculators/roi
- **Category**: financial
- **Summary**: Calculate Return on Investment (ROI) and annualised ROI for any financial or business decision.
- **Keywords**: roi, return on investment, business, investment return

### Inflation Impact Calculator
- **URL**: https://learntrix.in/calculators/inflation
- **Category**: financial
- **Summary**: See how inflation erodes purchasing power over time. Find the inflation-adjusted future value of any amount.
- **Keywords**: inflation, purchasing power, real value, cpi, money value

### Net Worth Calculator
- **URL**: https://learntrix.in/calculators/net-worth
- **Category**: financial
- **Summary**: Calculate your personal net worth by summing assets (savings, property, investments) and subtracting all liabilities (loans, debts).
- **Keywords**: net worth, assets, liabilities, wealth, personal finance

### BMI Calculator
- **URL**: https://learntrix.in/calculators/bmi
- **Category**: health
- **Summary**: Calculate Body Mass Index using height and weight. Shows BMI category, healthy weight range, and what it means for your body.
- **Keywords**: bmi, body mass index, weight, health, obesity

### TDEE / Calorie Calculator
- **URL**: https://learntrix.in/calculators/tdee
- **Category**: health
- **Summary**: Calculate your Total Daily Energy Expenditure (TDEE) and Basal Metabolic Rate (BMR). Get calorie targets for fat loss, maintenance, or muscle gain.
- **Keywords**: tdee, bmr, calories, calorie calculator, diet, weight loss

### Calorie Deficit Calculator
- **URL**: https://learntrix.in/calculators/calorie-deficit
- **Category**: health
- **Summary**: Calculate your exact daily calorie deficit target for safe, sustainable fat loss, projected goal weight date, and macro distribution.
- **Keywords**: calorie deficit, weight loss, deficit calculator, fat loss, daily calories, target weight, macro split

### Ideal Body Weight
- **URL**: https://learntrix.in/calculators/ideal-weight
- **Category**: health
- **Summary**: Calculate your ideal body weight using multiple established formulas (Hamwi, Devine, Robinson, Miller). See the range across all methods.
- **Keywords**: ideal weight, healthy weight, ibw, target weight

### Daily Water Intake
- **URL**: https://learntrix.in/calculators/water-intake
- **Category**: health
- **Summary**: Calculate how much water you should drink based on body weight, activity level, and climate. Get personalised hydration targets.
- **Keywords**: water intake, hydration, water calculator, daily water

### Body Fat Percentage
- **URL**: https://learntrix.in/calculators/body-fat
- **Category**: health
- **Summary**: Estimate body fat percentage using the Navy Method (waist, neck, height measurements). Includes healthy ranges by age and sex.
- **Keywords**: body fat, body fat percentage, navy method, fat calculator

### Pregnancy Due Date
- **URL**: https://learntrix.in/calculators/due-date
- **Category**: health
- **Summary**: Calculate your estimated due date (EDD) using Naegele's Rule from your last menstrual period (LMP). Shows trimester milestones.
- **Keywords**: pregnancy due date, edd, naegele, lmp, pregnancy calculator

### Percentage Calculator
- **URL**: https://learntrix.in/calculators/percentage
- **Category**: math
- **Summary**: All percentage calculations in one place: X% of Y, percentage change, percentage difference, what % is X of Y, and more.
- **Keywords**: percentage, percent, percentage change, percentage difference

### Fraction Calculator
- **URL**: https://learntrix.in/calculators/fraction
- **Category**: math
- **Summary**: Add, subtract, multiply, and divide fractions. Convert fractions to decimals, decimals to fractions, and simplify to lowest terms.
- **Keywords**: fraction, fractions, decimal, simplify, lcm, gcf

### Scientific Calculator
- **URL**: https://learntrix.in/calculators/scientific
- **Category**: math
- **Summary**: Perform advanced mathematical operations including trigonometric functions (sin, cos, tan), logarithms, powers, roots, and constants.
- **Keywords**: scientific, calculator, trigonometry, sin, cos, tan, log, math, algebra

### LCM & GCF / HCF Calculator
- **URL**: https://learntrix.in/calculators/lcm-gcf
- **Category**: math
- **Summary**: Find the Least Common Multiple (LCM) and Greatest Common Factor (GCF/HCF) for up to 6 numbers. Shows step-by-step prime factorisation.
- **Keywords**: lcm, gcf, hcf, highest common factor, lowest common multiple

### Quadratic Equation Solver
- **URL**: https://learntrix.in/calculators/quadratic
- **Category**: math
- **Summary**: Solve quadratic equations of the form ax² + bx + c = 0. Shows both roots, discriminant, vertex, and step-by-step solution.
- **Keywords**: quadratic, equation, roots, discriminant, parabola, algebra

### Statistics Calculator
- **URL**: https://learntrix.in/calculators/statistics
- **Category**: math
- **Summary**: Calculate mean, median, mode, standard deviation, variance, range, and quartiles for any dataset. Paste numbers, get full analysis.
- **Keywords**: statistics, mean, median, mode, standard deviation, variance

### Ratio Calculator
- **URL**: https://learntrix.in/calculators/ratio
- **Category**: math
- **Summary**: Simplify ratios, find equivalent ratios, and solve ratio problems. Supports 2-part and 3-part ratios with step-by-step explanation.
- **Keywords**: ratio, proportion, simplify ratio, equivalent ratio

### Speed, Distance & Time
- **URL**: https://learntrix.in/calculators/speed-distance
- **Category**: math
- **Summary**: Calculate any one of Speed, Distance, or Time when the other two are known. Supports km/h, mph, m/s and multiple time units.
- **Keywords**: speed, distance, time, velocity, physics, kinematics

### Prime Number Checker
- **URL**: https://learntrix.in/calculators/prime
- **Category**: math
- **Summary**: Check if any number is prime. Find all prime numbers up to a limit. Factor any number into its prime components.
- **Keywords**: prime number, prime checker, prime factorisation, sieve

### Age Calculator
- **URL**: https://learntrix.in/calculators/age
- **Category**: date-time
- **Summary**: Calculate exact age in years, months, days, hours, and minutes from any date of birth. Also shows next birthday countdown.
- **Keywords**: age, age calculator, birthday, dob, date of birth

### Date Difference Calculator
- **URL**: https://learntrix.in/calculators/date-diff
- **Category**: date-time
- **Summary**: Find the exact number of years, months, weeks, and days between any two dates. Add or subtract days, months, or years from a date.
- **Keywords**: date difference, days between dates, date calculator

### Business Days Calculator
- **URL**: https://learntrix.in/calculators/business-days
- **Category**: date-time
- **Summary**: Count working days between two dates excluding weekends and Indian public holidays. Add business days to any start date.
- **Keywords**: business days, working days, weekdays, holidays, india

### Retirement Planner
- **URL**: https://learntrix.in/calculators/retirement
- **Category**: date-time
- **Summary**: Calculate how much you need to retire comfortably. Input current savings, monthly contribution, expected returns, and retirement age.
- **Keywords**: retirement, retirement calculator, retirement planning, pension, corpus

### Event Countdown
- **URL**: https://learntrix.in/calculators/countdown
- **Category**: date-time
- **Summary**: Create a live countdown to any future date — exams, New Year, weddings, product launches. See days, hours, minutes, seconds.
- **Keywords**: countdown, event countdown, days left, timer, date countdown

### GPA / CGPA Calculator
- **URL**: https://learntrix.in/calculators/gpa
- **Category**: academic
- **Summary**: Calculate semester GPA and cumulative CGPA under 10-point (CBCS) and 4-point (US) grading systems. Add multiple subjects and credits.
- **Keywords**: gpa, cgpa, grade point average, cbcs, us gpa, university

### CGPA to Percentage
- **URL**: https://learntrix.in/calculators/cgpa-percent
- **Category**: academic
- **Summary**: Convert CGPA to percentage under different university standards — CBCS (×9.5), SPPU, Anna, VTU, Mumbai University and custom multipliers.
- **Keywords**: cgpa to percentage, cgpa convert, cbcs, university percentage

### Grade & Score Calculator
- **URL**: https://learntrix.in/calculators/grade
- **Category**: academic
- **Summary**: Calculate your overall grade from multiple assessment scores weighted by percentage. Shows letter grade and GPA equivalent.
- **Keywords**: grade calculator, weighted grade, score, marks calculator

### Attendance Calculator
- **URL**: https://learntrix.in/calculators/attendance
- **Category**: academic
- **Summary**: Check if you meet the minimum attendance requirement. Calculate how many classes you can miss or must attend to stay eligible.
- **Keywords**: attendance, attendance calculator, classes, college, university

### Unit Converter
- **URL**: https://learntrix.in/calculators/unit-converter
- **Category**: unit
- **Summary**: Convert units across Length, Weight, Temperature, Speed, Area, Volume, Pressure, and Energy. All in one comprehensive tool.
- **Keywords**: unit converter, length, weight, temperature, speed, area, volume

### NPS Tier-I Maturity Calculator
- **URL**: https://learntrix.in/calculators/nps
- **Category**: financial
- **Summary**: Project National Pension System (NPS) Tier-I retirement corpus, monthly annuity payout, and lump-sum tax-free withdrawal under PFRDA rules.
- **Keywords**: nps, pension, nps tier 1, retirement corpus, annuity, pfrda, india

### Sukanya Samriddhi Yojana (SSY)
- **URL**: https://learntrix.in/calculators/sukanya
- **Category**: financial
- **Summary**: Calculate 21-year maturity corpus for girl child under Sukanya Samriddhi Yojana (SSY) with current Govt interest rate.
- **Keywords**: sukanya samriddhi, ssy calculator, girl child scheme, 80c tax free, post office

### Home Loan Prepayment Calculator
- **URL**: https://learntrix.in/calculators/emi-prepayment
- **Category**: financial
- **Summary**: See how making lump-sum or extra monthly EMI prepayments reduces total interest and cuts loan tenure by years.
- **Keywords**: home loan prepayment, emi tenure reduction, loan interest savings, prepay emi

### Gratuity Calculator (India)
- **URL**: https://learntrix.in/calculators/gratuity
- **Category**: financial
- **Summary**: Calculate employee gratuity payout under Payment of Gratuity Act 1972 based on last drawn basic salary and completed years of service.
- **Keywords**: gratuity calculator, payment of gratuity act, basic salary, notice period, india

### Leave Encashment Tax Calculator
- **URL**: https://learntrix.in/calculators/leave-encashment
- **Category**: financial
- **Summary**: Calculate tax-exempt and taxable leave encashment amount upon retirement or resignation under Section 10(10AA).
- **Keywords**: leave encashment, section 10 10aa, earned leave tax, resignation payout

### JEE Percentile to Rank Predictor
- **URL**: https://learntrix.in/calculators/jee-rank
- **Category**: academic
- **Summary**: Estimate your All India Rank (AIR) and eligible NIT, IIIT, or GFTI college branches from your JEE Main NTA percentile score.
- **Keywords**: jee main percentile, jee rank predictor, nta score to rank, nit admission

### NEET Marks to Rank Predictor
- **URL**: https://learntrix.in/calculators/neet-score
- **Category**: academic
- **Summary**: Predict your All India NEET rank and estimate MBBS/BDS government medical college seat probabilities based on expected score out of 720.
- **Keywords**: neet mark to rank, neet score predictor, mbbs cut off 2026, medical seat

### Activity Calorie Burn Calculator
- **URL**: https://learntrix.in/calculators/calorie-burn
- **Category**: health
- **Summary**: Calculate calories burned for running, cycling, swimming, weight training, walking, and sports based on body weight and duration.
- **Keywords**: calories burned, exercise calories, met value, fat loss activity

### Macronutrient Split Calculator
- **URL**: https://learntrix.in/calculators/macro-split
- **Category**: health
- **Summary**: Calculate daily Protein, Carbohydrate, and Fat grams based on your total daily calories and fitness goals (Keto, High-Protein, Balanced).
- **Keywords**: macro split, protein carb fat, macronutrients, diet macro ratio